Other forms: seaweeds
Seaweed is the green and brown plants that grow under the sea. A strand of seaweed, dried seaweed, seaweed on the beach.
It is not really a plant but algae, with no true roots — the holdfast grips rock rather than feeding. Kelp forests are among the richest habitats there are and grow astonishingly fast. Seaweed is eaten widely, particularly in Japan and Wales, and laverbread is the Welsh version. Note that carrageenan and agar, both extracted from seaweed, are in an enormous share of processed food.
1nounseaweedThe green and brown algae that grow in the sea.
“Slippery seaweed covered the rocks at low tide.”
seaweed is a marine plant.
From sea + weed.
Etymology from Wiktionary, CC BY-SA